Silent door closer



July 3, 1928; 1,675,986

H. J. LEBHERZ SILENT DOOR CLOSER Filed Oct. 15, 1927 IKE-a A m M x x Q;i. g

9 INVENTOR.

' iTE- i m W Patented July 3, 1928.

UNITED STATES HARRY J. LEBHERZ, OF FREDERICK, MARYLAND,

PANY, OF FREDERICK, MARYLAND, A CORPORATION OF MARYLAND.

1,675,980 PATENT OFFICE.

ASSIGNOR TO THE EVEREDY COM- SILENT DOOR CLOSE R.

Application filed October 15, 1927.

for the provide means for regulating the pressure of air within apneumatic door check for controlling the movement of a door in orderthat the door check may be applicable to both heavy or light doors,insuring the closing of the door without slamming independently of theweight of the door.

Another object of my invention is to provide a construction of airregulating valve having a pneumatic door check which is readilyadjustable to control the escape of air from the door check and which iscapa ble of manufacture, production and assembly inexpensively from aminimum number of parts.

Other and further objects of my invention reside in the construction ofa valve for a pneumatic door closer as described more fully in thespecification hereinafter following by reference to the accompanyingdrawings in which:

Figure 1 is a plan view showing the assembly of the door check andcloser with reference to a door and door jamb; Fig. 2 is a sideelevation of the door check and closer illustrated in Fig. I; Fig. 3 isan enlarged cross-sectional view through a portion of the pneumatic doorcloser showing the position of the valve in the end of the pneumaticcylinder which constitutes the door closer; and Fig. 4 is a detailedview of the screw device forming the adjustable plug valve structure,the screw device being tapered for permittino variation in the area ofthe air port from the interior of the cylinder to the outside thereof.

My present invention is an improvement over the construction ofpneumatic door check and closer shown in my application Ser. No.215,925, filed August'27, 1927.

. In the production of the pneumatic door check andcloser of the generaldesign set forth in my aforesaid application, I have found theconstruction of valve to be eX-' tremely important in meeting variousservice requirements which are encountered under different conditions.That is to say, the pneumatic door' check and closer may be applied torelatively heavy doors as well as to relatively light doors, and underthese different conditions provision must be made Serial No. 226,450.

passage of air from the pneumatic door check at relatively differentrates of speed.

Referring to the drawings in detail reference character-1 designates adoor to which the pneumatic door check and closer of my invention isapplied. The door-jamb is reprcsentcd at 2, with a hinged connection 3between the door and the door jamb. A bracket 4 is shown secured to thedoor jamb 2 having projecting arms adapted to receive the end 5 of therod member (S'extending from the pneumatic door check and closer- Aspring device 7 extends between the arm 6 and bracket member a forexerting the required pressure upon the arm 6. The arm 6 extends in theform of a piston rod to a position inside of cylinder 7 and carriespistons8 thereon. Cylinder 7 is screw threaded at opposite ends andreceives end caps 9 and 10 as illustrated.

The cap 10 is aperturcd to permit the passage of arm or rod 6therethrough allowing free reciprocatory movement of the pistons 8. Thecap 9 is screwed fastto the end of cylinder 7 and may be rotated byrevolving the cylinder 7 as a whole, as represented by spiral lines inFig. 1. The cap 9 is provided with a central boss 11 which extends intothe cylinder 7 with an outwardly extending boss 12 on the cap 9, thebosses being interiorly threaded as represented at -l i for receivingthe screw threaded plug 15. The screw threaded plug 15 has a head 16thereon apertured as represented at 17 to permit a pin member 18 to bepassed therethrough and through thearms 19 of the bracket member 20. Thebracket member 20 is fastened to the door 1., A swivel connection istherefore provided between the end of the pneumatic door check andcloser and the bracket 20. The screw device serves as a connecting linkbetween arms 19 of the bracket 20 and .also as a relief valve.

the door checker closer may be applied. Afterthe pneumatic door checkand closer has been installed it is a simple matter to secure therequired. adjustment of air pressure by manually revolving the cylinder7, advancing or retracting the end cap 9 with respect to the screwthreaded plug 15 to that position at which the period over which the airescapes from the cylinder"? may be correct. v The structure of myinvention has been found to be extremely practicalin manufacture,production and use, and while I have described a preferred embodiment ofmy invention I desire that it be understood that modifications may bemade and that no limitations upon my invention are intended other thanare imposed by the scope of the appended claims. l v 7 What I claim asnew and'desire to secure by Letters Patent of the United States is asfollows:

' 1. In a pneumatic door check and closer a pneumatic cylinder, areciprocatory piston operative therein, an end cap secured to saidcylinder, a central portion on said end cap having internal screwthreads therein and a screw threaded plug engaging the screw threads insaid central portion of said end cap and having means for establishing apivotal connection with a door at the end thereof.

2. pneumatic door check and closer comprising a pneumatic cylinderpivotally connected with a door jamb, a screw thread ed cap closing oneend of said pneumatic cylinder, a plug screw threaded into said screwthreaded cap and pivotally connected with the door hinged with respectto said door jamb, said screw threaded plug being tapered to engage saidend cap and being adapted to be advanced or retracted with respect tosaid end cap for varying the area of the discharge port from theexterior to portion cast integral therewith, a tapered plug engaging thescrew threads 111 said end cap, and a pivotal connection between saidtapered plug and said bracket member, said tapered plug being advancedor retracted with respect to said screw threads in said end cap forregulating the movement of air from the outside to the, inside of saidpneumatic cylinder upon movement of said pistop rod. 4. Avalve-structure for a penumatic' door check and closer comprising acylinder, a piston operative in said c linder, an end cap secured to oneend of sai cylinder and having an inwardly extending central portion,screw threads on the interior of said central portion, a tapered screwthreaded plug arranged to engage the screw threads in said end cap,ahead extending from said plug, said tapered plug having arelativelylarge diameter adjacent saidhead and a relatively smaller diameterinteriorly of said cylinder, a pivotal connection between the head ofsaid screw threaded plug with a door whereby the advancing or retractingof said screw threaded end cap with respect to said screw threaded plugoperates 'to vary the passage of air to said pneumatic cylinder aroundthe screw threads of said plug for controlling the swinging movement ofthe door. In testimony whereof I afiix vmy signature.

' HARRY J. LEBHERZ.

